US9853559B2 - Power conversion device with reduced current deviation - Google Patents

Power conversion device with reduced current deviation Download PDF

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US9853559B2
US9853559B2 US15/123,564 US201515123564A US9853559B2 US 9853559 B2 US9853559 B2 US 9853559B2 US 201515123564 A US201515123564 A US 201515123564A US 9853559 B2 US9853559 B2 US 9853559B2
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power conversion
storage
power
current
conversion device
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US20170077829A1 (en
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Tomoisa Taniguchi
Morimitsu Sekimoto
Takurou Ogawa
Eiji Tooyama
Nobuo Hayashi
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Daikin Industries Ltd
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Daikin Industries Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/26—Power factor control [PFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/50—Reduction of harmonics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • H02M2001/0022—
    • H02M2001/0025—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4826—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode operating from a resonant DC source, i.e. the DC input voltage varies periodically, e.g. resonant DC-link inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to a power conversion device.
  • a power conversion device including a converter circuit and an inverter circuit, is used to supply power to the motor of a compressor.
  • some exemplary power conversion device attempts to increase the power factor by adopting a capacitor with a small capacitance, which is on the order of one-hundredth of that of a normal smoothing capacitor, as a capacitor provided between the converter circuit and the inverter circuit (such a capacitor will be hereinafter referred to as a “DC link capacitor”).
  • a capacitor with a small capacitance which is on the order of one-hundredth of that of a normal smoothing capacitor, as a capacitor provided between the converter circuit and the inverter circuit (such a capacitor will be hereinafter referred to as a “DC link capacitor”).
  • Such a power conversion device is disclosed, for example, in Patent Document 1.
  • PATENT DOCUMENT 1 Japanese Unexamined Patent Publication No. 2002-51589
  • a reactor is often provided on an input side (i.e., AC side) or output side (i.e., DC side) of the converter circuit.
  • This reactor and the DC link capacitor together form an LC resonant circuit, the resonance of which may cause distortion in the output current or voltage waveform of the converter circuit, i.e., may cause an increase in harmonics.
  • the inductance of a power supply system and the capacitor in the power conversion device may also form an LC resonant circuit, which may also cause distortion in current waveform. That is to say, the deviation of a current from a command value thereof increases.
  • a first aspect of the present invention provides a power conversion device including:
  • a power converter configured to convert, by performing ON/OFF operations on a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz), either an alternating current output from an AC power supply ( 30 ) or a direct current converted from the alternating current into a different alternating current having a predetermined frequency and a predetermined voltage;
  • a capacitor ( 12 a ) configured to smooth a ripple voltage generated as a result of the ON/OFF operations
  • a storage ( 62 ) configured to store multiple values, each correlated to a disturbance that causes distortion in a current (Iin) to the power converter ( 13 ), in association with a phase angle ( ⁇ in) of a voltage (Vin) of the AC power supply ( 30 );
  • a power conversion controller ( 50 , 60 ) configured to control the ON/OFF operations by using the values stored in the storage ( 62 ) to compensate for a manipulated variable (iT*) of control performed by the power converter ( 13 ) in association with the phase angle ( ⁇ in) of the voltage (Vin) of the AC power supply ( 30 ).
  • the ON/OFF operations of the power converter ( 13 ) are performed based on the values stored in the storage ( 62 ).
  • a second aspect of the present invention is an embodiment of the first aspect.
  • each of the values correlated to the disturbance is selected from the group consisting of:
  • ) of a converter circuit ( 11 ) configured to convert an output of the AC power supply ( 30 ) into a direct current
  • a third aspect of the present invention is an embodiment of the first or second aspect. In the third aspect,
  • the power conversion controller ( 50 , 60 ) controls a power of the power converter ( 13 ) based on the values stored in the storage ( 62 ).
  • the power of the power converter ( 13 ) may be controlled based on the stored values.
  • a fourth aspect of the present invention is an embodiment of the first or second aspect.
  • the power conversion controller ( 50 , 60 ) controls a current at the power converter ( 13 ) based on the values stored in the storage ( 62 ).
  • the current at the power converter ( 13 ) may be controlled based on the stored values.
  • a fifth aspect of the present invention is an embodiment of any one of the first to fourth aspects.
  • the fifth aspect is an embodiment of any one of the first to fourth aspects.
  • the power conversion controller ( 50 , 60 ) compensates for the manipulated variable (iT*) using the multiple different values correlated to the disturbance.
  • the power or current of the power converter ( 13 ) may be controlled based on the multiple stored values.
  • a sixth aspect of the present invention is an embodiment of any one of the first to fifth aspects.
  • the sixth aspect is an embodiment of any one of the first to fifth aspects.
  • the power conversion controller ( 50 , 60 ) makes interpolation between the discontinuous values using data stored in the storage ( 62 ).
  • the deviation of a current from a command value thereof may be reduced in a power conversion device.
  • FIG. 1 illustrates a configuration for a power conversion device according to a first embodiment of the present invention.
  • FIG. 2 shows the respective waveforms of a current of an AC power supply, a voltage of the AC power supply, and a DC link voltage.
  • FIG. 3 illustrates a control system for an inverter circuit according to the first embodiment.
  • FIG. 4 illustrates an exemplary configuration for a compensator.
  • FIG. 5 shows how the compensator performs its compensation operation.
  • FIG. 6 shows the respective waveforms of a supply voltage, a phase angle, a current command value, an output current value, a deviation, a second current command value, and a drive current command value.
  • FIG. 7 illustrates a configuration for a compensator according to a variation of the first embodiment.
  • FIG. 8 shows how to update a deviation storage in a situation where one storage period is shorter than one carrier period.
  • FIG. 9 illustrates a control system for an inverter circuit according to a second embodiment.
  • FIG. 10 illustrates a control system for an inverter circuit according to a third embodiment.
  • FIG. 11 illustrates an exemplary configuration for a feedback controller.
  • FIG. 12 illustrates a control system for an inverter circuit according to a fourth embodiment.
  • FIG. 13 illustrates a control system for an inverter circuit according to a fifth embodiment.
  • FIG. 14 is a flowchart showing how to update a deviation storage according to a sixth embodiment.
  • FIG. 1 illustrates a configuration for a power conversion device ( 10 ) according to a first embodiment of the present invention.
  • This power conversion device ( 10 ) may be used to supply power to a motor for driving the compressor of an air conditioner (not shown), for example, and other devices.
  • the power conversion device ( 10 ) includes a converter circuit ( 11 ), a DC section ( 12 ), an inverter circuit ( 13 ), a controller ( 50 ), and a compensator ( 60 ).
  • the power conversion device ( 10 ) converts AC power supplied from a single-phase AC power supply ( 30 ) into AC power having a predetermined frequency and a predetermined voltage, and supplies the converted AC power to a motor ( 20 ).
  • the motor ( 20 ) is provided to drive the compressor described above and may be a so-called “interior permanent magnet (IPM) motor,” for example.
  • the converter circuit ( 11 ) is connected to the AC power supply ( 30 ) via a reactor (L 1 ), and rectifies the alternating current supplied from the AC power supply ( 30 ) into a direct current.
  • the converter circuit ( 11 ) is configured as a diode bridge circuit in which four diodes (D 1 -D 4 ) are connected together to form a bridge. Using these diodes (D 1 -D 4 ), the converter circuit ( 11 ) subjects the AC voltage of the AC power supply ( 30 ) to a full-wave rectification, thereby converting the AC voltage into a DC voltage.
  • the DC section ( 12 ) includes a capacitor ( 12 a ), which is connected between the positive and negative output nodes of the converter circuit ( 11 ).
  • a DC voltage generated between the two terminals of the capacitor ( 12 a ) (hereinafter referred to as a “DC link voltage (vdc)”) is applied to an input node of the inverter circuit ( 13 ).
  • the capacitor ( 12 a ) is connected to the positive output node of the converter circuit ( 11 ) via another reactor (hereinafter referred to as a reactor (L 2 )).
  • the reactor (L 1 ) and the capacitor ( 12 a ) form an LC resonant circuit.
  • the reactor (L 2 ) and the capacitor ( 12 a ) also form an LC resonant circuit. Even if no reactors (L 1 , L 2 ) were provided, an LC resonant circuit would also be formed by an inductance that the power supply system has and the capacitor ( 12 a ). The LC resonance produced in this LC resonant circuit may cause distortion in the output current waveform of the converter circuit ( 11 ).
  • the compensator ( 60 ) to be described in detail later provides a countermeasure against the distortion of the output current waveform.
  • This capacitor ( 12 a ) has such a capacitance that allows itself to smooth only a ripple voltage (voltage variation) generated while the switching elements (to be described later) of the inverter circuit ( 13 ) are performing a switching operation. That is to say, the capacitor ( 12 a ) is a small-capacitance capacitor which does not have such a capacitance that allows itself to smooth the voltage rectified by the converter circuit ( 11 ) (i.e., a voltage varying according to the supply voltage). A film capacitor may be used as the capacitor ( 12 a ).
  • FIG. 2 shows the respective waveforms of the current of the AC power supply ( 30 ), the voltage (Vin) of the AC power supply ( 30 ), and the DC link voltage (vdc).
  • the DC link voltage (vdc) has so large a pulsation that its maximum value (Vmax) becomes twice or more as large as its minimum value (Vmin).
  • the inverter circuit ( 13 ) has its input node connected to the capacitor ( 12 a ), and is supplied with a pulsating DC voltage (i.e., the DC link voltage (vdc)). By turning the switching elements (to be described later) ON and OFF, the inverter circuit ( 13 ) converts the output of the DC section ( 12 ) into three-phase alternating currents (U, V, W), and supplies these currents to the motor ( 20 ). That is to say, the motor ( 20 ) constitutes a load for the inverter circuit ( 13 ).
  • a pulsating DC voltage i.e., the DC link voltage (vdc)
  • the inverter circuit ( 13 ) of this embodiment has a configuration in which each of a plurality of switching elements is bridge-connected.
  • This inverter circuit ( 13 ) includes six switching elements (Su, Sv, Sw, Sx, Sy, Sz) in order to output three-phase alternating currents to the motor ( 20 ). More specifically, this inverter circuit ( 13 ) includes three switching legs in each of which two switching elements are connected together in series. In each switching leg, an intermediate point between the upper-arm switching element (Su, Sv, Sw) and the lower-arm switching element (Sx, Sy, Sz) is connected to the coil of an associated phase of the motor ( 20 ). Also, a freewheeling diode (Du, Dv, Dw, Dx, Dy, Dz) is connected anti-parallel to each of these switching elements (Su, Sv, Sw, Sx, Sy, Sz).
  • the inverter circuit ( 13 ) switches the DC link voltage (vdc) supplied from the DC section ( 12 ) and converts the DC link voltage (vdc) into a three-phase AC voltage having a predetermined frequency and a predetermined voltage, and supplies the voltage to the motor ( 20 ).
  • Such control of the ON/OFF operations is performed by the controller ( 50 ). That is to say, the inverter circuit ( 13 ) converts the direct current, into which the alternating current supplied from the AC power supply ( 30 ) has been converted, into an alternating current having a predetermined frequency and a predetermined voltage, and functions as an exemplary power converter according to the present invention.
  • FIG. 3 illustrates a control system for the inverter circuit ( 13 ) according to the first embodiment.
  • This controller ( 50 ) includes a microcomputer (not shown) and a program installed therein to operate the microcomputer. By controlling the ON/OFF operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz), the controller ( 50 ) controls the current of the inverter circuit ( 13 ). That is to say, as the output of the inverter circuit ( 13 ) is controlled by the controller ( 50 ), the drive of the motor ( 20 ) is controlled.
  • the drive of the motor ( 20 ) may be controlled, for example, by d-q axis vector control.
  • the controller ( 50 ) of this embodiment includes a velocity controller ( 51 ), a multiplier ( 52 ), an adder ( 53 ), a dq current command value generator ( 54 ), a coordinate transformer ( 55 ), a dq axis current controller ( 56 ), and a PWM calculator ( 57 ).
  • the velocity controller ( 51 ) calculates the deviation of the rotational angular frequency ( ⁇ ) of the mechanical angle of the motor ( 20 ) from the command value ( ⁇ *) of the mechanical angle. Then, the velocity controller ( 51 ) performs proportional integral (PI) operation on the deviation and outputs a result of the operation as a first current command value (im*) to the multiplier ( 52 ).
  • PI proportional integral
  • the multiplier ( 52 ) multiplies together the absolute value of the sine value (
  • This second current command value (iT*) is a motor current amplitude command value, and is an exemplary manipulated variable of the control to be performed by the power converter in accordance with the present invention.
  • the adder ( 53 ) adds together the second current command value (iT*) and a compensation current command value (icomp*) (to be described later) generated by the compensator ( 60 ), and outputs a result of the addition (hereinafter referred to as a “drive current command value (idq*)”) to the dq current command value generator ( 54 ).
  • the dq current command value generator ( 54 ) calculates a d-axis current command value (id*) and a q-axis current command value (iq*) based on the drive current command value (idq*) and the command value ( ⁇ *) of the phase ( ⁇ ) of the current to flow through the motor ( 20 ), and outputs them to the dq axis current controller ( 56 ).
  • the dq current command value generator ( 54 ) generates a d-axis current command value (id*) by multiplying the sine value ( ⁇ sin ⁇ *) of the command value ( ⁇ *) and the drive current command value (idq*) together, and also generates a q-axis current command value (iq*) by multiplying the cosine value (cos ⁇ *) of the command value ( ⁇ *) and the drive current command value (idq*) together.
  • the coordinate transformer ( 55 ) calculates a d-axis current value (id) and a q-axis current value (iq) based on the angle of rotation (which is an electrical angle ( ⁇ e)) of the rotor (not shown) of the motor ( 20 ) and phase currents (iu, iv, iw) of the inverter circuit ( 13 ).
  • the dq axis current controller ( 56 ) generates a d-axis voltage command value (Vd*) and a q-axis voltage command value (Vq*) so as to reduce the deviation of the d-axis current value (id) from the d-axis current command value (id*) and the deviation of the q-axis current value (iq) from the q-axis current command value (iq*), respectively, and outputs these voltage command values to the PWM calculator ( 57 ).
  • the PWM calculator ( 57 ) receives the d-axis and q-axis voltage command values (Vd*, Vq*), the DC link voltage (vdc), and the electrical angle ( ⁇ e). Based on these values, the PWM calculator ( 57 ) generates a control signal (G) (hereinafter also referred to as a “PWM output”) to control the ON/OFF operations of the respective switching elements (Su, Sv, Sw, Sx, Sy, Sz) of the inverter circuit ( 13 ) and outputs the control signal (G) to the inverter circuit ( 13 ).
  • the PWM output (G) is updated on a predetermined period (hereinafter referred to as a “carrier period (Tc)” or an update period (Tc)”) basis.
  • the compensator ( 60 ) generates a compensation current command value (icomp*) to compensate for (as will be described later) the second current command value (iT*).
  • the controller ( 50 ) and the compensator ( 60 ) together form an exemplary power conversion controller according to the present invention.
  • the compensator ( 60 ) includes a microcomputer (not shown) and a program installed therein to operate the microcomputer.
  • FIG. 4 shows an exemplary configuration for the compensator ( 60 ). As shown in FIG.
  • this compensator ( 60 ) includes a subtractor ( 61 ), a deviation storage ( 62 ), a first index generator ( 63 ), a power supply phase calculator ( 64 ), a second index generator ( 65 ), and a magnitude of compensation calculator ( 66 ).
  • the subtractor ( 61 ) calculates the deviation of the output current value (
  • This deviation is correlated to a disturbance that causes distortion in a current to the inverter circuit ( 13 ) (i.e., the output current value (
  • ) is a measured value.
  • ) is generated as the product of the amplitude of the fundamental wave component of the input current value (Iin) of the converter circuit ( 11 ) and
  • the deviation storage ( 62 ) has a plurality (or an arrangement) of storage areas and stores the deviations calculated by the subtractor ( 61 ).
  • This deviation storage ( 62 ) is an exemplary storage according to the present invention.
  • the number (hereinafter referred to as “K”) of the storage areas in the deviation storage ( 62 ) is set such that a period (hereinafter referred to as a storage period (Tm)) corresponding to ⁇ /K [rad] of one voltage period of the AC power supply ( 30 ) (hereinafter referred to as a “power supply period”) becomes equal to or shorter than one carrier period (Tc).
  • the deviation storage ( 62 ) is allowed to store K deviations in a period corresponding to a half of one power supply period (hereinafter referred to as a “power supply half period”).
  • one storage period (Tm) agrees with one carrier period (Tc).
  • idx ⁇ in1/( ⁇ /K) is supposed to be satisfied.
  • the index (idx) falls within the range of 0 to K ⁇ 1.
  • the deviation storage ( 62 ) the deviation at the phase angle ( ⁇ in1) is stored in a storage area associated with the index (idx) calculated. That is to say, the deviation storage ( 62 ) stores multiple deviations of the output current values (
  • the power supply phase calculator ( 64 ) calculates the phase angle ( ⁇ in2) at the timing of compensating for the second current command value (iT*).
  • the power supply phase calculator ( 64 ) outputs, based on the phase angle ( ⁇ in1) at the starting point of control processing (such as current control), the phase angle ( ⁇ in2) at the endpoint of an update period (Tc) to which the output of the control processing is applied as a PWM signal.
  • FIG. 5 shows how the compensator ( 60 ) performs its compensation operation.
  • FIG. 5 shown are m th through (m+2) th carrier periods (Tc), where m is an integer equal to or greater than zero.
  • FIG. 6 shows the respective waveforms of a supply voltage (Vin), a phase angle ( ⁇ in), a current command (
  • Vin supply voltage
  • ⁇ in phase angle
  • a current command
  • an output current value
  • iT* deviation
  • idq* drive current command value
  • FIG. 6 shown are the waveforms in three power supply half periods (i.e., from (n ⁇ 1) th through (n+1) th power supply half periods).
  • the controller ( 50 ) When a carrier period (Tc) begins, the controller ( 50 ) starts performing the control processing. For example, when the control processing for the m th carrier period (Tc) starts, the controller ( 50 ) measures the output current value (
  • This compensation current command value (icomp*) is added by the adder ( 53 ) to (and compensates for) the second current command value (iT*).
  • the second current command value (iT*) is compensated for such that the distortion caused in the output current (Iin) due to the deviation (correlated to the disturbance) of the output current value (
  • the second current command value (iT*) thus corrected is output as a drive current command value (idq*) to the dq current command value generator ( 54 ).
  • the dq current command value generator ( 54 ) generates a d-axis current command value (id*) and a q-axis current command value (iq*) using the drive current command value (idq*) that is the compensated second current command value (iT*). Then, the dq axis current controller ( 56 ) generates a d-axis voltage command value (Vd*) and a q-axis voltage command value (Vq*). When the d-axis voltage command value (Vd*) and q-axis voltage command value (Vq*) are generated, the PWM calculator ( 57 ) outputs a control signal (G) to the inverter circuit ( 13 ).
  • the inverter circuit ( 13 ) operates so as to reduce the distortion of the output current waveform of the converter circuit ( 11 ).
  • the LC resonance produced by the capacitor ( 12 a ) and the reactors (L 1 , L 2 ) may be reduced in this manner based on the stored deviation (i.e., a value correlated to the disturbance), because the LC resonance has a steady-state repetitive waveform.
  • the deviation storage ( 62 ) updates, based on a disturbance detected every carrier period (Tc), the storage area to store the disturbance. For example, in the m th carrier period (Tc), when finishing outputting the compensation current command value (icomp*), the compensator ( 60 ) updates the data stored in the deviation storage ( 62 ) based on the output current value (
  • ) and phase angle ( ⁇ in1) which were detected when the m th carrier period (Tc) began. Specifically, the first index generator ( 63 ) calculates an index based on the phase angle ( ⁇ in1). In this example, idx j 1 . As a result, in the compensator ( 60 ), the j 1 th deviation Iin_err(j 1 ) is updated.
  • the same operation is performed in the (m+1) th carrier period (Tc) as well.
  • the (j 2 +1) th deviation Iin_err(j 2 +1) is updated.
  • the index (idx) is calculated based on the phase angle ( ⁇ in) when the control processing is started in each carrier period (Tc).
  • ) is also detected at the starting point of the control processing. If the carrier period (Tc) agrees with the storage period (Tm) as in this embodiment, the index (idx) is updated synchronously with the start of the control processing, and the index increments one by one every control period. Thus, every data in the deviation storage ( 62 ) is updated without exception every power supply half period.
  • deviations i.e., values correlated to a disturbance
  • the manipulated variable (iT*) of current control of the inverter circuit ( 13 ) is compensated for based on the value stored a power supply half period ago.
  • the deviation of a current from a command value thereof may be reduced. More specifically, the distortion of the output current of the converter circuit ( 11 ) (i.e., the distortion of an input current to the inverter circuit ( 13 )) caused by a disturbance with a repetitive waveform such as LC resonance may be reduced easily.
  • the compensated value is obtained based on the stored deviations, and therefore, the compensation may be done speedily.
  • FIG. 7 illustrates a configuration for a compensator ( 60 ) according to such a variation of the first embodiment.
  • the compensator ( 60 ) of this variation includes not only all components of the compensator ( 60 ) of the first embodiment but also an additional data interpolator ( 68 ) as well.
  • FIG. 8 shows how to update the deviation storage ( 62 ) in a situation where one storage period (Tm) is shorter than one carrier period (Tc).
  • Tm storage period
  • Tc carrier period
  • m th and (m+1) th carrier periods
  • m is an integer equal to or greater than zero.
  • the index (idx) is updated asynchronously with the start of the control processing.
  • the index (idx) may increase by two.
  • the index (idx) when the m th carrier period (Tc) begins is j 1
  • the data interpolator ( 68 ) is made to sense that the index has increased by two or more and to make interpolation between the data in the non-updated storage areas using the deviations obtained last time and the deviations obtained this time.
  • the values stored in the storage ( 62 ) are discontinuous (i.e., if there is any storage area in which the data has not been updated), that discontinuous interval (i.e., the storage area in which the data has not been updated) is interpolated based on the data stored in the storage ( 62 ).
  • such interpolation processing may prevent the deviation storage ( 62 ) from having any storage area which is not updated for a long time. That is to say, according to this variation, even if the storage period (Tm) is asynchronous with the carrier period (Tc), the distortion of the output current of the converter circuit ( 11 ) may still be reduced with more reliability. In other words, the deviation of a current from a command value thereof may also be reduced according to this variation.
  • the data stored in a non-updated storage area may also be updated in the same way as described above based on the data stored in an updated storage area.
  • FIG. 9 illustrates a control system for an inverter circuit ( 13 ) according to a second embodiment.
  • another compensator ( 60 ) and a subtractor ( 67 ) are added as shown in FIG. 9 to the control system of the first embodiment.
  • the additional compensator ( 60 ) also has the same configuration as the compensator ( 60 ) of the first embodiment. However, a different signal is input to the additional compensator ( 60 ) from the one input to the compensator ( 60 ) of the first embodiment.
  • these two compensators ( 60 ) are respectively identified by reference signs with two different branch numbers ( ⁇ 1, ⁇ 2).
  • the original compensator is identified by ( 60 - 1 ) and the additional compensator is identified by ( 60 - 2 ).
  • the subtractor ( 61 ) calculates the deviation of capacitor energy (Ce) from a command value (Ce*) of the capacitor energy (Ce). Specifically, the subtractor ( 61 ) subtracts the capacitor energy (Ce) from the command value (Ce*) and outputs the difference thus obtained as the deviation.
  • the capacitor energy (Ce) is energy stored in the capacitor ( 12 a ) of the DC section ( 12 ). This value may be calculated based on the DC link voltage (vdc).
  • the command value (Ce*) is its command value and calculated based on a target value of the DC link voltage (vdc).
  • the target value of the DC link voltage (vdc) is defined such that the DC link voltage (vdc) has a substantially sinusoidal waveform.
  • the deviation storage ( 62 ) of the additional compensator ( 60 - 2 ) of the additional compensator ( 60 - 2 ) the deviation of the capacitor energy (Ce) from the command value (Ce*) thereof is stored in association with the phase angle ( ⁇ in) of the voltage (Vin) of the AC power supply ( 30 ).
  • This deviation is also an exemplary value correlated to a disturbance that causes distortion in the current (Iin) to the power converter according to the present invention.
  • the compensation current command value (icomp**) obtained by the additional compensator ( 60 - 2 ) is subtracted by the subtractor ( 67 ) from the output of the original compensator ( 60 - 1 ).
  • the output of the subtractor ( 67 ) is supplied as a compensated value of the second current command value (iT*) to the adder ( 53 ).
  • these two compensators ( 60 - 1 , 60 - 2 ) and the adder ( 53 ) together form a current command value compensator.
  • the compensation is made based on not only the output current value (
  • Such additional compensation based on the capacitor energy (Ce) may reduce the disturbance to be caused by input and output currents of the capacitor ( 12 a ) in the DC section, and may bring the output current value (
  • the capacitor energy (Ce) of the DC section ( 12 ) is greater than the command value (Ce*) of the capacitor energy
  • the second current command value (iT*) is compensated for such that the output power of the inverter circuit ( 13 ) is further increased.
  • the capacitor energy (Ce) is less than the command value (Ce*)
  • the second current command value (iT*) is compensated for such that the output power of the inverter circuit ( 13 ) is further decreased.
  • the compensated value is obtained based on the stored deviations (i.e., values correlated to a disturbance), and therefore, the compensation may be done speedily.
  • FIG. 10 illustrates a control system for an inverter circuit ( 13 ) according to a third embodiment.
  • a feedback controller ( 80 ) is added to the control system of the first embodiment.
  • the feedback controller ( 80 ) compensates for the current command (
  • FIG. 11 illustrates an exemplary configuration for the feedback controller ( 80 ).
  • the feedback controller ( 80 ) includes a subtractor ( 81 ) and a PI calculator ( 82 ).
  • the subtractor ( 81 ) calculates the deviation of the output current value (
  • the PI calculator ( 82 ) performs a proportional integral (PI) operation on the output of the subtractor ( 81 ) and outputs a result of the operation as a compensation current command value (icomp***), which is then added to the output of the compensator ( 60 ).
  • the sum is input to the adder ( 53 ) of the controller ( 50 ).
  • the distortion caused in the output current of the converter circuit ( 11 ) due to not only a steady-state disturbance such as the LC resonance mentioned above but also a non-steady-state disturbance may be reduced.
  • appropriate adjustment of the balance between the gain (Gp) of the compensator ( 60 ) and the gain of the feedback controller ( 80 ) may prevent the control by the feedback controller ( 80 ) from affecting the control by the compensator ( 60 ) excessively.
  • FIG. 12 illustrates a control system for an inverter circuit ( 13 ) according to a fourth embodiment.
  • the controller ( 50 ) of this embodiment includes a velocity controller ( 51 ), a multiplier ( 52 ), an adder ( 53 ), a coordinate transformer ( 55 ), a power controller ( 58 ), a dq axis current controller ( 56 ), and a PWM calculator ( 57 ).
  • the velocity controller ( 51 ) calculates the deviation of the rotational angular frequency ( ⁇ ) of the mechanical angle of the motor ( 20 ) from a command value ( ⁇ *) of the mechanical angle. Then, the velocity controller ( 51 ) performs proportional integral (PI) operation on the deviation and outputs a result of the operation as a first power command value (p*) to the multiplier ( 52 ).
  • PI proportional integral
  • the multiplier ( 52 ) multiplies together the square of the sine value (sin 2 ( ⁇ in)) of the phase angle ( ⁇ in) of the voltage (Vin) at the AC power supply ( 30 ) and the first power command value (p*), and outputs a result of the multiplication as a second power command value (p**).
  • This second power command value (p**) is a command value of the power output from the inverter circuit ( 13 ) (i.e., power converter), and is an exemplary manipulated variable of the control to be performed by the power converter.
  • the adder ( 53 ) adds together the second power command value (p**) and a compensation power command value (pcomp*) (to be described later) generated by the compensator ( 60 ), and outputs a result of the addition (hereinafter referred to as a “drive power command value (p***)”) to the power controller ( 58 ).
  • the power controller ( 58 ) calculates, based on the drive power command value (p***) and the number of revolutions ( ⁇ ) of the motor, a motor torque command value, generates a d-axis current command value and a q-axis current command value in accordance with the motor torque command value, and then outputs them to the dq-axis current controller ( 56 ). Specifically, based on various motor constants such as a d-axis inductance, a q-axis inductance, the number of flux linkages, the coil resistance, and the number of motor poles, the power controller ( 58 ) generates a d-axis current command value and a q-axis current command value in accordance with the motor torque command value.
  • the coordinate transformer ( 55 ) calculates a d-axis current value (id) and a q-axis current value (iq) based on the angle of rotation (which is an electrical angle ( ⁇ e)) of the rotor (not shown) of the motor ( 20 ) and phase currents (iu, iv, iw) of the inverter circuit ( 13 ).
  • the dq axis current controller ( 56 ) generates a d-axis voltage command value (Vd*) and a q-axis voltage command value (Vq*) so as to reduce the deviation of the d-axis current value (id) from the d-axis current command value (id*) and the deviation of the q-axis current value (iq) from the q-axis current command value (iq*), respectively, and outputs these voltage command values to the PWM calculator ( 57 ).
  • the PWM calculator ( 57 ) receives the d-axis and q-axis voltage command values (Vd*, Vq*), the DC link voltage (vdc), and the electrical angle ( ⁇ e). Based on these values, the PWM calculator ( 57 ) generates a control signal (G) (hereinafter also referred to as a “PWM output”) to control the ON/OFF operations of the respective switching elements (Su, Sv, Sw, Sx, Sy, Sz) of the inverter circuit ( 13 ) and outputs the control signal (G) to the inverter circuit ( 13 ).
  • the PWM output (G) is updated on a predetermined period (hereinafter referred to as a “carrier period (Tc)” or an “update period (Tc)”) basis.
  • the compensator ( 60 ) generates a compensation power command value (pcomp*) to compensate for (as will be described later) the second power command value (p**).
  • the compensator ( 60 ) includes a microcomputer (not shown) and a program installed therein to operate the microcomputer. As in the example shown in FIG. 4 , the compensator ( 60 ) of this embodiment also includes a subtractor ( 61 ), a deviation storage ( 62 ), a first index generator ( 63 ), a power supply phase calculator ( 64 ), a second index generator ( 65 ), and a magnitude of compensation calculator ( 66 ).
  • the subtractor ( 61 ) calculates the deviation of the output current value (
  • This deviation is an exemplary value correlated to a disturbance that causes distortion in a current (Iin) to the power converter according to the present invention.
  • ) is a measured value.
  • ) is generated as the product of the amplitude of the fundamental wave component of the input current value (Iin) of the converter circuit ( 11 ) and
  • the deviation storage ( 62 ) has a plurality (or an arrangement) of storage areas and stores the deviations calculated by the subtractor ( 61 ).
  • This deviation storage ( 62 ) is an exemplary storage according to the present invention.
  • the number (hereinafter referred to as “K”) of the storage areas of the deviation storage ( 62 ) is set such that a period (hereinafter referred to as a storage period (Tm)) corresponding to ⁇ /K [rad] of one voltage period of the AC power supply ( 30 ) (hereinafter referred to as a “power supply period”) becomes equal to or shorter than one carrier period (Tc).
  • the deviation storage ( 62 ) is allowed to store K deviations in a period corresponding to a half of one power supply period (hereinafter referred to as a “power supply half period”).
  • one storage period (Tm) agrees with one carrier period (Tc).
  • idx ⁇ in1/( ⁇ /K) is supposed to be satisfied.
  • the index (idx) falls within the range of 0 to K ⁇ 1.
  • the deviation storage ( 62 ) the deviation at the phase angle ( ⁇ in1) is stored in a storage area associated with the index (idx) calculated. That is to say, the deviation storage ( 62 ) stores multiple deviations of the output current values (
  • the power supply phase calculator ( 64 ) calculates the phase angle ( ⁇ in2) at the timing of compensating for the second current command value (iT*).
  • the power supply phase calculator ( 64 ) outputs, based on the phase angle ( ⁇ in1) at the starting point of control processing (such as current control), the phase angle ( ⁇ in2) at the endpoint of an update period (Tc) to which the output of the control processing is applied as a PWM signal.
  • the second index generator ( 65 ) calculates, based on the phase angle ( ⁇ in2) obtained by the power supply phase calculator ( 64 ), an index (idx) specifying any of the storage areas of the deviation storage ( 62 ).
  • FIG. 5 shown are m th through (m+2) th carrier periods (Tc), where m is an integer equal to or greater than zero.
  • the controller ( 50 ) When a carrier period (Tc) begins, the controller ( 50 ) starts performing the control processing. For example, when the control processing for the m th carrier period (Tc) starts, the controller ( 50 ) measures the output current value (
  • This compensation power command value (pcomp*) is added by the adder ( 53 ) to (and compensates for) the second power command value (p**).
  • the second power command value (p**) is compensated for such that the distortion caused in the output current (Iin) due to the deviation (correlated to the disturbance) of the output current value (
  • the second power command value (p**) thus corrected is output as a drive power command value (p***) to the power controller ( 58 ).
  • a d-axis current command value (id*) and a q-axis current command value (iq*) are generated based on the drive power command value (p***) that is the compensated second power command value (p**).
  • the dq axis current controller ( 56 ) generates a d-axis voltage command value (Vd*) and a q-axis voltage command value (Vq*).
  • the PWM calculator ( 57 ) outputs a control signal (G) to the inverter circuit ( 13 ).
  • the inverter circuit ( 13 ) operates so as to reduce the distortion of the output current waveform of the converter circuit ( 11 ).
  • the LC resonance produced by the capacitor ( 12 a ) and the reactors (L 1 , L 2 ) may be reduced in this manner based on the stored deviation (i.e., a value correlated to the disturbance), because the LC resonance has a steady-state repetitive waveform.
  • the deviation storage ( 62 ) updates, based on a disturbance detected every carrier period (Tc), the storage area to store the disturbance. For example, in the m th carrier period (Tc), when finishing outputting the compensation power command value (pcomp*), the compensator ( 60 ) updates the data stored in the deviation storage ( 62 ) based on the output current value (
  • ) and phase angle ( ⁇ in1) which were detected when the m th carrier period (Tc) began. Specifically, the first index generator ( 63 ) calculates an index based on the phase angle ( ⁇ in1). In this example, idx j 1 . As a result, in the compensator ( 60 ), the j 1 th deviation Iin_err(j 1 ) is updated.
  • the same operation is performed in the (m+1) th carrier period (Tc) as well.
  • the (j 2 +1) th deviation Iin_err(j 2 +1) is updated.
  • the index (idx) is calculated based on the phase angle ( ⁇ in) when the control processing is started in each carrier period (Tc).
  • ) is also detected at the starting point of the control processing. If the carrier period (Tc) agrees with the storage period (Tm) as in this embodiment, the index (idx) is updated synchronously with the start of the control processing, and the index increments one by one every control period. Thus, every data in the deviation storage ( 62 ) is updated without exception every power supply half period.
  • the manipulated variable of the power control performed by the inverter circuit ( 13 ) is compensated for. Even so, the same or similar advantages to those of the first embodiment described above may also be achieved.
  • FIG. 13 illustrates a control system for an inverter circuit ( 13 ) according to a fifth embodiment.
  • another compensator ( 60 ) and a subtractor ( 67 ) are added to the control system of the first embodiment.
  • the additional compensator ( 60 ) also has the same configuration as the compensator ( 60 ) of the first embodiment. However, a different signal is input to the additional compensator ( 60 ) from the one input to the compensator ( 60 ) of the first embodiment.
  • these two compensators ( 60 ) are respectively identified by reference signs with two different branch numbers ( ⁇ 1, ⁇ 2).
  • the original compensator is identified by ( 60 - 1 ) and the additional compensator is identified by ( 60 - 2 ).
  • the subtractor ( 61 ) calculates the deviation of the DC link voltage (vdc) from a command value (vdc*) of the DC link voltage (vdc). Specifically, the subtractor ( 61 ) subtracts the DC link voltage from the command value (vdc*) and outputs the difference thus obtained as the deviation.
  • the deviation storage ( 62 ) of the additional compensator ( 60 - 2 ) of the additional compensator ( 60 - 2 ) the deviation of the DC link voltage (vdc) from the command value (vdc*) thereof is stored in association with the phase angle ( ⁇ in) of the voltage (Vin) of the AC power supply ( 30 ).
  • This deviation is also an exemplary value correlated to a disturbance that causes distortion in the current (Iin) to the power converter according to the present invention.
  • the compensation current command value (icomp**) obtained by the additional compensator ( 60 - 2 ) is subtracted by the subtractor ( 67 ) from the output of the original compensator ( 60 - 1 ).
  • the output of the subtractor ( 67 ) is supplied as a compensated value of the second current command value (iT*) to the adder ( 53 ).
  • the compensation is made based on not only the output current value (
  • Such additional compensation based on the DC link voltage (vdc) may reduce the disturbance to be caused between the supply voltage (Vin) and the DC link voltage (vdc), and may bring the output current value (
  • the second current command value (iT*) is compensated for such that the output power of the inverter circuit ( 13 ) is further increased.
  • the DC link voltage (vdc) is less than the command value (vdc*)
  • the second current command value (iT*) is compensated for such that the output power of the inverter circuit ( 13 ) is further decreased.
  • the compensated value is obtained based on the stored deviations (i.e., values correlated to a disturbance), and therefore, the compensation may be done speedily.
  • FIG. 14 is a flowchart showing how to update the deviation storage ( 62 ) according to the sixth embodiment of the present invention.
  • This embodiment provides the flow shown in FIG. 14 by changing the compensator ( 60 ) of the first embodiment. Note that the series of processing steps shown in FIG. 14 are carried out after the current command (
  • the first index generator ( 63 ) In the compensator ( 60 ), the first index generator ( 63 ) generates an index (idx) indicating the storage location of the deviation of this time in the deviation storage ( 62 ) (in Step S 11 ).
  • the index (idx) generated by the first index generator ( 63 ) increments one by one, and changes cyclically within the range of 0 to K ⁇ 1, as the phase angle ( ⁇ in1) increases monotonically.
  • the compensator ( 60 ) makes the subtractor ( 61 ) calculate the deviation of the output current value (
  • the compensator ( 60 ) stores the deviation of this time (i.e., the deviation obtained in Step S 12 ) in any of the areas of the deviation storage ( 62 ) associated with the index (idx) (in Step S 13 ). Note that when the deviation is stored, the moving average between the deviation of this time and a past value stored in the deviation storage ( 62 ) may be calculated and the result may be stored instead of the deviation of this time.
  • the series of these three processing steps S 11 , S 12 , and S 13 will be performed repeatedly every carrier period (Tc) until the deviation storage ( 62 ) obtains a predetermined number of (i.e., K in this example) values to be stored. That is to say, according to this embodiment, values correlated to a disturbance (i.e., the current command (
  • values correlated to the disturbance are also stored in the deviation storage ( 62 ) and the compensation current command value (icomp*) to compensate for the second current command value (iT*) may be generated based on those correlated values.
  • the distortion of the output current of the converter circuit ( 11 ) i.e., the distortion of an input current to the inverter circuit ( 13 )
  • a disturbance with a repetitive waveform such as LC resonance may also be reduced easily and speedily. That is to say, the deviation of a current from a command value thereof may also be reduced according to this embodiment.
  • the deviation obtaining method of this sixth embodiment in which no interpolation is made intentionally with one storage period (Tm) set to be shorter than one disturbance variation period be adopted.
  • Tm storage period
  • the data stored in the deviation storage ( 62 ) is updated through sampling over multiple power supply half periods.
  • control system of a power conversion device generally includes a velocity control system.
  • the magnitude of compensation to be made by the compensator ( 60 ) may be set to be zero when the power conversion device starts running.
  • the magnitude of compensation to be made by the compensator ( 60 ) may be set to be zero.
  • ) over multiple power supply half periods may be averaged on an index (idx) basis, and the deviation of the average value from the current command (
  • ) may be averaged if the moving average of the output current values (
  • the compensation based on the capacitor energy (Ce) does not always have to be carried out in combination with the compensation based on the output current value (
  • the power conversion device ( 10 ) does not have to include the converter circuit ( 11 ) and the inverter circuit ( 13 ).
  • the power conversion device ( 10 ) may also be implemented as a so-called “matrix converter” configured to convert an alternating current directly into an alternating current having a predetermined frequency and a predetermined voltage.
  • the values correlated to the disturbance are not limited to the exemplary ones adopted in the embodiments and their variations described above.
  • the correlated value may also be a deviation of a current to a power converter (such as the inverter circuit ( 13 ) or a matrix converter) from the command value of the current to the power converter.
  • the correlated value does not have to be a deviation but may also be a current to a power converter (such as the inverter circuit ( 13 ) or a matrix converter), the output current value (
  • controller ( 50 ) may compensate for the q-axis current command value (iq*) instead of the second current command value (iT*).
  • the present invention is useful as a power conversion device.

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10277115B2 (en) 2016-04-15 2019-04-30 Emerson Climate Technologies, Inc. Filtering systems and methods for voltage control
US10284132B2 (en) 2016-04-15 2019-05-07 Emerson Climate Technologies, Inc. Driver for high-frequency switching voltage converters
US10305373B2 (en) 2016-04-15 2019-05-28 Emerson Climate Technologies, Inc. Input reference signal generation systems and methods
US10312798B2 (en) 2016-04-15 2019-06-04 Emerson Electric Co. Power factor correction circuits and methods including partial power factor correction operation for boost and buck power converters
US10437317B2 (en) 2016-04-15 2019-10-08 Emerson Climate Technologies, Inc. Microcontroller architecture for power factor correction converter
US10656026B2 (en) 2016-04-15 2020-05-19 Emerson Climate Technologies, Inc. Temperature sensing circuit for transmitting data across isolation barrier
US10763740B2 (en) 2016-04-15 2020-09-01 Emerson Climate Technologies, Inc. Switch off time control systems and methods
US11843327B2 (en) 2019-09-05 2023-12-12 Toshiba Mitsubishi-Electric Industrial Systems Corporation Power conversion device with current hysteresis band control

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5817947B1 (ja) * 2014-06-19 2015-11-18 ダイキン工業株式会社 電力変換制御装置
WO2017056298A1 (ja) * 2015-10-01 2017-04-06 三菱電機株式会社 電力変換装置及びこれを用いた空気調和装置
JP6566105B2 (ja) * 2017-09-29 2019-08-28 ダイキン工業株式会社 電力変換装置
CN111279602B (zh) * 2017-10-30 2021-06-04 大金工业株式会社 功率转换装置
WO2020196472A1 (ja) * 2019-03-27 2020-10-01 ダイキン工業株式会社 モータ駆動装置および冷却装置
CN109995305B (zh) * 2019-04-26 2020-11-10 深圳和而泰智能控制股份有限公司 压缩机的力矩输入控制方法、装置、设备和冰箱

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051589A (ja) 2000-07-31 2002-02-15 Isao Takahashi モータ駆動用インバータの制御装置
US6629064B1 (en) 1999-03-09 2003-09-30 Capstone Turbine Corporation Apparatus and method for distortion compensation
JP2005124298A (ja) 2003-10-16 2005-05-12 Matsushita Electric Ind Co Ltd インダクションモータ駆動用インバータ制御装置および空気調和機
JP2005130675A (ja) 2003-10-27 2005-05-19 Daikin Ind Ltd インバータ制御方法及び多相電流供給回路
JP2009225631A (ja) 2008-03-18 2009-10-01 Toyota Motor Corp インバータの駆動装置
US20140203755A1 (en) * 2013-01-24 2014-07-24 Regal Beloit America, Inc. Methods and systems for controlling an electric motor
US20140225545A1 (en) * 2013-02-08 2014-08-14 Regal Beloit America, Inc. Systems and methods for controlling electric machines
US20140354208A1 (en) * 2012-02-24 2014-12-04 Kabushiki Kaisha Yaskawa Denki Motor control apparatus
US20150180401A1 (en) * 2013-12-23 2015-06-25 Regal Beloit America, Inc. Methods and systems for envelope and efficiency control in an electric motor

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07245979A (ja) * 1994-03-08 1995-09-19 Toshiba Corp 交流電動機の速度制御装置
US6091205A (en) * 1997-10-02 2000-07-18 Lutron Electronics Co., Inc. Phase controlled dimming system with active filter for preventing flickering and undesired intensity changes
JP3681941B2 (ja) * 1999-12-27 2005-08-10 三菱電機株式会社 電源高調波抑制装置
JP4718041B2 (ja) * 2000-11-22 2011-07-06 ダイキン工業株式会社 インバータ制御方法およびその装置
JP2003339169A (ja) * 2002-05-21 2003-11-28 Sanken Electric Co Ltd 電源装置
EP2034605B1 (en) * 2006-08-31 2012-03-28 Mitsubishi Electric Corporation Electric motor driving device, and compressor driving device
JP5002343B2 (ja) * 2007-06-18 2012-08-15 株式会社豊田中央研究所 交流電動機の駆動制御装置
JP5409034B2 (ja) * 2009-02-13 2014-02-05 トヨタ自動車株式会社 回転電機制御装置
JP2011217512A (ja) * 2010-03-31 2011-10-27 Fujitsu General Ltd Ｄｃブラシレスモータ制御装置
JP5692569B2 (ja) * 2010-08-23 2015-04-01 株式会社ジェイテクト 車両用操舵装置
JP5212491B2 (ja) * 2011-01-18 2013-06-19 ダイキン工業株式会社 電力変換装置
JP5772843B2 (ja) * 2013-02-08 2015-09-02 株式会社デンソー 交流電動機の制御装置
JP5682644B2 (ja) * 2013-03-11 2015-03-11 株式会社安川電機 マトリクスコンバータ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6629064B1 (en) 1999-03-09 2003-09-30 Capstone Turbine Corporation Apparatus and method for distortion compensation
JP2002051589A (ja) 2000-07-31 2002-02-15 Isao Takahashi モータ駆動用インバータの制御装置
JP2005124298A (ja) 2003-10-16 2005-05-12 Matsushita Electric Ind Co Ltd インダクションモータ駆動用インバータ制御装置および空気調和機
JP2005130675A (ja) 2003-10-27 2005-05-19 Daikin Ind Ltd インバータ制御方法及び多相電流供給回路
JP2009225631A (ja) 2008-03-18 2009-10-01 Toyota Motor Corp インバータの駆動装置
US20110007536A1 (en) 2008-03-18 2011-01-13 Toyota Jidosha Kabushiki Kaisha Device for driving inverter
US20140354208A1 (en) * 2012-02-24 2014-12-04 Kabushiki Kaisha Yaskawa Denki Motor control apparatus
US20140203755A1 (en) * 2013-01-24 2014-07-24 Regal Beloit America, Inc. Methods and systems for controlling an electric motor
US20140225545A1 (en) * 2013-02-08 2014-08-14 Regal Beloit America, Inc. Systems and methods for controlling electric machines
US20150180401A1 (en) * 2013-12-23 2015-06-25 Regal Beloit America, Inc. Methods and systems for envelope and efficiency control in an electric motor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Extended European Search Report dated Oct. 17, 2017 in Patent Application No. 15767771.7.
International Search Report issued in PCT/JP2015/001800, dated Jun. 30, 2015.

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10277115B2 (en) 2016-04-15 2019-04-30 Emerson Climate Technologies, Inc. Filtering systems and methods for voltage control
US10284132B2 (en) 2016-04-15 2019-05-07 Emerson Climate Technologies, Inc. Driver for high-frequency switching voltage converters
US10305373B2 (en) 2016-04-15 2019-05-28 Emerson Climate Technologies, Inc. Input reference signal generation systems and methods
US10312798B2 (en) 2016-04-15 2019-06-04 Emerson Electric Co. Power factor correction circuits and methods including partial power factor correction operation for boost and buck power converters
US10320322B2 (en) 2016-04-15 2019-06-11 Emerson Climate Technologies, Inc. Switch actuation measurement circuit for voltage converter
US10437317B2 (en) 2016-04-15 2019-10-08 Emerson Climate Technologies, Inc. Microcontroller architecture for power factor correction converter
US10656026B2 (en) 2016-04-15 2020-05-19 Emerson Climate Technologies, Inc. Temperature sensing circuit for transmitting data across isolation barrier
US10763740B2 (en) 2016-04-15 2020-09-01 Emerson Climate Technologies, Inc. Switch off time control systems and methods
US10770966B2 (en) 2016-04-15 2020-09-08 Emerson Climate Technologies, Inc. Power factor correction circuit and method including dual bridge rectifiers
US10928884B2 (en) 2016-04-15 2021-02-23 Emerson Climate Technologies, Inc. Microcontroller architecture for power factor correction converter
US11387729B2 (en) 2016-04-15 2022-07-12 Emerson Climate Technologies, Inc. Buck-converter-based drive circuits for driving motors of compressors and condenser fans
US11843327B2 (en) 2019-09-05 2023-12-12 Toshiba Mitsubishi-Electric Industrial Systems Corporation Power conversion device with current hysteresis band control

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